Leases Supplemental Balance Sheet Information Related To Leases (Details) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 31, 2019
Leases [Abstract]
Total operating lease right-of-use assets	$ 56,613	$ 62,251
Accrued liabilities	13,528	13,900
Long-term operating lease liabilities	49,772	55,652
Total operating lease liabilities	63,300	69,552
Other long-lived assets, at cost	757	823
Accumulated depreciation	(427)	(391)
Other long-lived assets, net	$ 330	$ 432